diff --git a/sys/dev/pci/pci.c b/sys/dev/pci/pci.c
index 76bc808d14c8..3da4d2996265 100644
--- a/sys/dev/pci/pci.c
+++ b/sys/dev/pci/pci.c
@@ -174,10 +174,10 @@ struct pci_quirk {
 };
 
 struct pci_quirk pci_quirks[] = {
-	/*
-	 * The Intel 82371AB has a map register at offset 0x90.
-	 */
+	/* The Intel 82371AB has a map register at offset 0x90. */
 	{ 0x71138086, PCI_QUIRK_MAP_REG,	0x90,	 0 },
+	/* As does the Serverworks OSB4 (the SMBus mapping register) */
+	{ 0x02001166, PCI_QUIRK_MAP_REG,	0x90,	 0 },
 
 	{ 0 }
 };